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FLUOR DANIEL GTI <br /> May 16, 1997 <br /> Mr Steve Sasson <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Webster Avenue, Third Floor <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject Drake Property <br /> 26485 Thornton Road <br /> Thornton, California <br /> Dear Mr Sasson <br /> This letter presents analytical results of the domestic well sampling activities conducted at the subject <br /> site on April 30, 1997 Fluor Daniel GTI, Inc (Fluor Daniel GTI) personnel, in the presence of Mr Steve <br /> Sasson of the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD), <br /> sampled the inactive domestic water well located on the north area of the Drake site (west of the Pine <br /> Street& Thornton Road intersection), and the operating domestic water well located on the adjoining <br /> Garamendi property immediately to the west of the subject site Samples were collected in appropriate <br /> glassware under the inspection of Mr Sasson, placed in an ice-containing insulated container, and <br /> transported under Chain-of-Custody manifest to WEST Laboratory of Davis Samples were analyzed <br /> for benzene,toluene, ethylbenzene and total xylenes (BTEX),total petroleum hydrocarbons-as- <br /> gasoline (TPH-G),total petroleum hydrocarbons-as-diesel (TPH-D), both with and without silica-gel <br /> clean-up, and methyl tertiary-butyl ether(MTBE) <br /> Analytical results are presented in Table 1 (Attachment 1) Samples DW-GW and OW-GW were <br /> below detection limits for BTEX, TPH-G, and MTBE TPH-D analysis run on both samples revealed <br /> concentrations below detection limits after performing a silica-gel clean-up In the absence of a silica- <br /> gel clean-up, sample DW-GW contained 86 micrograms per liter (ug/L, equivalent to parts per billion, <br /> or ppb) of diesel-range hydrocarbons (noted by the lab as not typical diesel hydrocarbons) The <br /> atypical diesel-range hydrocarbons in sample DW-GW are likely of vegetable origin, indeed, the lab <br /> report notes that" organic matter was visibly present in the sample before extraction" (Attachment 2) <br /> Because of the lack of BTEX or petroleum hydrocarbons in these samples, Fluor Daniel GTI requests <br /> that PHS/EHD grant closure status to the site Additional rationale in support of this request is <br /> presented in Fluor Daniel GTI's November 26, 1996 Feasibility Study/Corrective Action Plan <br /> (Attachment 3) <br /> srcrgst Itr <br /> 1401 Halyard Drive, Suite 140 /West Sacramento, CA 95691 USA (916) 372-4700 FAX (916) 372-8781 <br />